<!DOCTYPE html>

<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>标记选择器</title>

        <style type="text/css">
            /* 标记选择器 ( tag selector ) */
            div { border: 1px solid blue ; }
            p { border: 1px solid green ; }
            b { color: red ; }
            u { color: blue ; }
        </style>

    </head>
    <body>

        <div >
            <b>天猫</b>
        </div>

        <div >
            <b>淘宝</b>
        </div>

        <div >
            <u>腾讯</u>
        </div>

        <p>字节跳动</p>

        <p>阿里巴巴</p>

    </body>
</html>